Centering subview's X in autolayout throws “not prepared for the constraint”

Question

I have a custom UIView subclass which is being initialized via a nib.

In -awakeFromNib, I\'m creating a subview and attempting to center it in its super

Answer 1

In my case, it was solved by using root view as a container of constraints instead of a currently created view.

I mean, use inside viewController

view.addConstraints([leftConstraintImage, topConstraintImage]) instead of imageView.addConstraints...